gmcounter

Description: The GM Counter Accessory is capable of generating a DC voltage of up to 1 kV using a 5V pulse produced on the PWG. The voltage is controlled by varying the duty cycle of the pulse. A high voltage, which is divided by 200, is connected to CH0 for monitoring purposes. The pulse generated by the GM counter when radiation passes through it is processed and sent to the CNTR input of the Phoenix for counting.

The GM Counter Accessory operates by utilizing a Geiger-Müller (GM) tube, which detects ionizing radiation. Upon detection, the tube generates a pulse that signifies the presence of radiation. This pulse is then fed into a processing unit, which counts the occurrences of radiation events. The initial 5V pulse generated on the pulse width generator (PWG) serves as a trigger for the system.

The high voltage supply for the GM tube is crucial for its operation, as it enables the tube to detect radiation effectively. The voltage can reach up to 1 kV, which is required to create the electric field necessary for the ionization of gas within the tube. To maintain safety and ensure measurement accuracy, this high voltage is stepped down by a factor of 200 before being monitored at channel CH0. This allows for real-time observation of the voltage being applied to the GM tube without exposing the monitoring equipment to high voltage levels.

The duty cycle of the 5V pulse is adjustable, allowing for fine-tuning of the output voltage. By varying the duty cycle, the average voltage applied to the GM tube can be controlled, which directly influences its sensitivity and response time to radiation events. This feature provides flexibility in different operational environments and applications.

The processed pulse output from the GM counter is directed to the CNTR input of the Phoenix counting system. This integration enables the counting of radiation events, facilitating data collection and analysis. The Phoenix system can then provide further processing and display of the count data, allowing users to monitor radiation levels effectively.

Overall, the GM Counter Accessory is a sophisticated device that combines high voltage generation, pulse modulation, and radiation detection, making it an essential tool in radiation monitoring applications.The GM Counter Accessory is shown below. It can generate a DC voltage upto 1 KV using the 5V pulse generated on PWG. The duty cycle of the pulse is varied to control the voltage. The high voltage applied to the GM tube is divided by 200 and connected to CH0 for monitoring. The pulse generated by the GM counter when radiation passes through it is p rocessed and given to CNTR input of Phoenix for counting. Click here for the circuit schematic.